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Trnkova L. Elimination voltammetry as an innovative tool of electroanalysis. J Electroanal Chem (Lausanne) 2022. [DOI: 10.1016/j.jelechem.2021.115961] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Hrdlička V, Choińska M, Ruiz Redondo B, Barek J, Navrátil T. Determination of heavy metal poisoning antidote 2,3-dimercapto-1-propanesulfonic acid using silver solid amalgam electrode. Electrochim Acta 2020. [DOI: 10.1016/j.electacta.2020.136623] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Triskova I, Veznik J, Lacina K, Trnkova L. Dramatic changes in the electrochemical and spectroscopic behavior of DNA fragments induced by the loss of a single nucleotide. Bioelectrochemistry 2020; 134:107515. [PMID: 32200262 DOI: 10.1016/j.bioelechem.2020.107515] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2020] [Revised: 03/13/2020] [Accepted: 03/13/2020] [Indexed: 12/17/2022]
Abstract
In this paper, the d(GCGAAGC) heptamer and the closely related d(GCGAGC) hexamer are examined via electrochemical (cyclic voltammetry) and spectroscopic (circular dichroism) methods. Dramatic changes in the CD spectroscopic and CV electrochemical properties, induced by the loss of only one single nucleotide (A), are detected. The CD spectra and native polyacrylamide gel electrophoresis (PAGE) confirmed structural changes taking place in the relevant chain-like oligodeoxynucleotide assemblies. Dedicated studies suggest that the heptamer (Hp) possesses a hairpin structure, whereas the hexamer (Hx) appears to be rather a duplex. Both of the structures exhibited completely different adsorption behavior at the hanging mercury drop electrode, and this factor was readily confirmed by means of elimination voltammetry with linear scan (EVLS). We established that the Hp hairpin (~-1300 mV), compared to the Hx duplex (~-1360 mV), is the thermodynamically favored electron acceptor. The adsorption isotherms were constructed based on the voltammetric peak height values, reflecting the reduction of the adenine (A) and cytosine (C) moieties as well as the oxidation of the 7,8-dihydroguanine (7,8-DHG) moieties. Finally, as revealed by the spectroscopic and electrochemical results, Hx forms a bimolecular antiparallel homo-duplex carrying both Watson-Crick base pairs (CG or GC) and mismatched edge-to-edge base pairs (GA or AG).
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Affiliation(s)
- Iveta Triskova
- Department of Chemistry, Faculty of Science, Masaryk University, Kamenice 5, CZ-625 00 Brno, Czech Republic
| | - Jakub Veznik
- Department of Chemistry, Faculty of Science, Masaryk University, Kamenice 5, CZ-625 00 Brno, Czech Republic; CEITEC - Central European Institute of Technology, Masaryk University, Kamenice 5, CZ-625 00 Brno, Czech Republic
| | - Karel Lacina
- CEITEC - Central European Institute of Technology, Masaryk University, Kamenice 5, CZ-625 00 Brno, Czech Republic
| | - Libuse Trnkova
- Department of Chemistry, Faculty of Science, Masaryk University, Kamenice 5, CZ-625 00 Brno, Czech Republic.
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Trnkova L, Triskova I, Vorlickova M, Kejnovska I, Dvorakova Z, Pivonkova H, Fiala R. Comparative Electrochemical and Spectroscopic Studies of I‐Motif‐forming DNA Nonamers. ELECTROANAL 2019. [DOI: 10.1002/elan.201900323] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Libuse Trnkova
- Department of Chemistry, Faculty of ScienceMasaryk University, Kamenice 5 CZ-625 00 Brno Czech Republic
| | - Iveta Triskova
- Department of Chemistry, Faculty of ScienceMasaryk University, Kamenice 5 CZ-625 00 Brno Czech Republic
| | - Michaela Vorlickova
- Institute of Biophysics of the Czech Academy of Sciences, Kralovopolska 135 CZ-612 65 Brno Czech Republic
| | - Iva Kejnovska
- Institute of Biophysics of the Czech Academy of Sciences, Kralovopolska 135 CZ-612 65 Brno Czech Republic
| | - Zuzana Dvorakova
- Institute of Biophysics of the Czech Academy of Sciences, Kralovopolska 135 CZ-612 65 Brno Czech Republic
| | - Hana Pivonkova
- Institute of Biophysics of the Czech Academy of Sciences, Kralovopolska 135 CZ-612 65 Brno Czech Republic
| | - Radovan Fiala
- CEITEC MU – Central European Institute of Technology, Faculty of ScienceMasaryk University, Kamenice 5 CZ-625 00 Brno Czech Republic
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Skalová Š, Navrátil T, Barek J, Vyskočil V. Voltammetric determination of sodium anthraquinone-2-sulfonate using silver solid amalgam electrodes. MONATSHEFTE FUR CHEMIE 2017. [DOI: 10.1007/s00706-017-1926-8] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Switching central trinucleotide sequences of DNA heptamer regulates adsorption on mercury electrode. MONATSHEFTE FUR CHEMIE 2016. [DOI: 10.1007/s00706-016-1689-7] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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Nováková K, Hrdlička V, Navrátil T, Harvila M, Zima J, Barek J. Application of silver solid amalgam electrode for determination of formamidine amitraz. MONATSHEFTE FUR CHEMIE 2015. [DOI: 10.1007/s00706-015-1575-8] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Determination of 5-nitroindazole using silver solid amalgam electrode. MONATSHEFTE FUR CHEMIE 2014. [DOI: 10.1007/s00706-014-1346-y] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Navratil R, Jelen F, Ugur Kayran Y, Trnkova L. A Pencil Graphite Electrode In Situ Modified by Monovalent Copper: a Promising Tool for the Determination of Methylxanthines. ELECTROANAL 2014. [DOI: 10.1002/elan.201400017] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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The use of copper solid amalgam electrodes for determination of the pesticide thiram. J Solid State Electrochem 2013. [DOI: 10.1007/s10008-013-2035-1] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Voltammetric monitoring of electrochemical reduction of riboflavin using silver solid amalgam electrodes. Electrochim Acta 2012. [DOI: 10.1016/j.electacta.2012.05.009] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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References. Anal Chem 2012. [DOI: 10.1201/b11478-14] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Affiliation(s)
- Emil Paleček
- Institute of Biophysics, Academy of Sciences of the Czech Republic, v.v.i., Kralovopolska 135, 612
65 Brno, Czech Republic
| | - Martin Bartošík
- Institute of Biophysics, Academy of Sciences of the Czech Republic, v.v.i., Kralovopolska 135, 612
65 Brno, Czech Republic
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Pilarova I, Lubal P, Trnkova L. Potentiometric and Voltammetric Study of 6-Benzylaminopurine and Its Derivatives. ELECTROANAL 2012. [DOI: 10.1002/elan.201100491] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Zitka O, Skutkova H, Adam V, Trnkova L, Babula P, Hubalek J, Provaznik I, Kizek R. A New Approach how to Define the Coefficient of Electroactivity of Adenine and Its Twelve Derivatives Using Flow Injection Analysis with Amperometric Detection. ELECTROANAL 2011. [DOI: 10.1002/elan.201100064] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
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Aladag N, Trnkova L, Kourilova A, Ozsoz M, Jelen F. Voltammetric Study of Aminopurines on Pencil Graphite Electrode in the Presence of Copper Ions. ELECTROANAL 2010. [DOI: 10.1002/elan.201000031] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
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Galandova J, Trnkova L, Mikelova R, Labuda J. Investigation of a DNA-Based Biosensor with Chitosan-Carbon Nanotubes Interface by Cyclic and Elimination Voltammetry. ELECTROANAL 2009. [DOI: 10.1002/elan.200804450] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Jelen F, Kourilova A, Hason S, Kizek R, Trnkova L. Voltammetric Study of Adenine Complex with Copper on Mercury Electrode. ELECTROANAL 2009. [DOI: 10.1002/elan.200804418] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Amperometric Sensor for Detection of Chloride Ions. SENSORS 2008; 8:5619-5636. [PMID: 27873832 PMCID: PMC3705522 DOI: 10.3390/s8095619] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/31/2008] [Revised: 09/09/2008] [Accepted: 09/11/2008] [Indexed: 11/16/2022]
Abstract
Chloride ion sensing is important in many fields such as clinical diagnosis, environmental monitoring and industrial applications. We have measured chloride ions at a carbon paste electrode (CPE) and at a CPE modified with solid AgNO3, a solution of AgNO3 and/or solid silver particles. Detection limits (3 S/N) for chloride ions were 100 μM, 100 μM and 10 μM for solid AgNO3, solution of AgNO3 and/or solid silver particles, respectively. The CPE modified with silver particles is the most sensitive to the presence chloride ions. After that we approached to the miniaturization of the whole electrochemical instrument. Measurements were carried out on miniaturized instrument consisting of a potentiostat with dimensions 35 × 166 × 125 mm, screen printed electrodes, a peristaltic pump and a PC with control software. Under the most suitable experimental conditions (Britton-Robinson buffer, pH 1.8 and working electrode potential 550 mV) we estimated the limit of detection (3 S/N) as 500 nM.
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Krizkova S, Hrdinova V, Adam V, Burgess EPJ, Kramer KJ, Masarik M, Kizek R. Chip-Based CE for Avidin Determination in Transgenic Tobacco and Its Comparison with Square-Wave Voltammetry and Standard Gel Electrophoresis. Chromatographia 2008. [DOI: 10.1365/s10337-008-0606-6] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Adam V, Baloun J, Fabrik I, Trnkova L, Kizek R. An Electrochemical Detection of Metallothioneins at the Zeptomole Level in Nanolitre Volumes. SENSORS 2008; 8:2293-2305. [PMID: 27879822 PMCID: PMC3673418 DOI: 10.3390/s8042293] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/15/2008] [Accepted: 03/26/2008] [Indexed: 11/16/2022]
Abstract
An Electrochemical Detection of Metallothioneins at the Zeptomole Level in Nanolitre VolumesWe report on improvement of the adsorptive transfer stripping technique (AdTS) coupled with the differential pulse voltammetry Brdicka reaction to determine a thiol-protein. The current technique has been unable to generate reproducible results when analyzing very low sample volumes (nanolitres). This obstacle can be overcome technically by modifying the current transfer technique including cooling step of the adsorbed analyte. We tested the technique on determination of a promising tumour disease marker protein called metallothionein (MT). The detection limit (3 S/N) of MT was evaluated as 500 zeptomoles per 500 nL (1 pM) and the quantification limit (10 S/N) as 1,500 zeptomoles per 500 nL (3 pM). Further, the improved AdTS technique was utilized to analyze blood serum samples from patients with breast cancer. Based on the results obtained it can be concluded that the improved technique can be used to detect a thiolprotein in very low sample volumes and can also prevent interferences during the washing and transferring step.
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Affiliation(s)
- Vojtech Adam
- Department of Chemistry and Biochemistry, Mendel University of Agriculture and Forestry, Zemedelska 1, CZ-613 00 Brno, Czech Republic; E-mail:
- Department of Animal Nutrition and Forage Production, Faculty of Agronomy, Mendel University of Agriculture and Forestry, Zemedelska 1, CZ-613 00 Brno, Czech Republic
| | - Jiri Baloun
- Department of Chemistry and Biochemistry, Mendel University of Agriculture and Forestry, Zemedelska 1, CZ-613 00 Brno, Czech Republic; E-mail:
| | - Ivo Fabrik
- Department of Chemistry and Biochemistry, Mendel University of Agriculture and Forestry, Zemedelska 1, CZ-613 00 Brno, Czech Republic; E-mail:
- Department of Biochemistry, Masaryk University, Kotlarska 2, CZ-611 37 Brno, Czech Republic
| | - Libuse Trnkova
- Department of Chemistry, Faculty of Science, Masaryk University, Kotlarska 2, CZ-611 37 Brno, Czech Republic
| | - Rene Kizek
- Department of Chemistry and Biochemistry, Mendel University of Agriculture and Forestry, Zemedelska 1, CZ-613 00 Brno, Czech Republic; E-mail:
- Author to whom correspondence should be addressed; E-mail:
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Utilizing of Square Wave Voltammetry to Detect Flavonoids in the Presence of Human Urine. SENSORS 2007; 7:2402-2418. [PMID: 28903234 PMCID: PMC3864529 DOI: 10.3390/s7102402] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/10/2007] [Accepted: 10/17/2007] [Indexed: 11/17/2022]
Abstract
About biological affecting of flavonoids on animal organisms is known less, thus we selected flavonoids, flavanones and flavones, and their glycosides, which were examined as potential inducers of cytochrome(s) P450 when administrated by gavages into experimental male rats. The study was focused on induction of CYP1A1, the major cytochrome P450 involved in carcinogen activation. The data obtained demonstrate the necessity of taking into account not only ability of flavonoids to bind to Ah receptor (induction factor) but also to concentrate on their distribution and metabolism (including colon microflora) in the body. After that we examined certain flavonoids as potential inducers of cytochrome P450, we wanted to suggest and optimize suitable electrochemical technique for determination of selected flavonoids (quercetin, quercitrin, rutin, chrysin and diosmin) in body liquids. For these purposes, we selected square wave voltannetry using carbon paste electrode. Primarily we aimed on investigation of their basic electrochemical behaviour. After that we have optimized frequency, step potential and supporting electrolyte. Based on the results obtained, we selected the most suitable conditions for determination of the flavonoids as follows: frequency 180 Hz, step potential 1.95 mV/s and phosphate buffer of pH 7 as supporting electrolyte. Detection limits (3 S/N) of the flavonoids were from units to tens of nM except diosmin, where the limit were higher than μM. In addition, we attempted to suggest a sensor for analysis of flavonoids in urine. It clearly follows from the results obtained that flavonoids can be analysed in the presence of animal urine, because urine did not influence much the signals of flavonoids (recoveries of the signals were about 90 %).
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Adam V, Beklova M, Pikula J, Hubalek J, Trnkova L, Kizek R. Shapes of Differential Pulse Voltammograms and Level of Metallothionein at Different Animal Species. SENSORS 2007; 7:2419-2429. [PMID: 28903235 PMCID: PMC3864530 DOI: 10.3390/s7102419] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/01/2007] [Accepted: 10/17/2007] [Indexed: 11/16/2022]
Abstract
Metallothioneins play a key role in maintaining homeostasis of essential metals and in protecting of cells against metal toxicity as well as oxidative damaging. Excepting humans, blood levels of metallothionein have not yet been reported from any animal species. Blood plasma samples of 9 animal species were analysed by the adsorptive transfer stripping technique to obtain species specific voltammograms. Quite distinct records were obtained from the Takin (Budorcas taxicolor), while other interesting records were observed in samples from the European Bison (Bison bonasus bonasus) and the Red-eared Slider (Trachemys scripta elegans). To quantify metallothionein the catalytic peak Cat2 was used, well developed in the Domestic Fowl (Gallus gallus f. domestica) and showing a very low signal in the Red Deer (Cervus elaphus). The highest levels of metallothionein reaching over 20 µM were found in the Domestic Fowl. High levels of MT were also found in the Bearded Dragon (Pogona vitticeps) and the Grey Wolf (Canis lupus lupus). The lowest values of about 1-3 µM were determined in the Red-eared Slider, Takin and Red Deer. Employing a simple electrochemical detection it was possible to examine variation in blood metallothionein in different species of vertebrates.
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Affiliation(s)
- Vojtech Adam
- Department of Chemistry and BiochemistryMendel University of Agriculture and Forestry, Zemedelska 1, CZ-613 00 Brno, Czech Republic
| | - Miroslava Beklova
- Department of Veterinary Ecology and Environmental Protection, Faculty of Veterinary Hygiene and Ecology, University of Veterinary and Pharmaceutical Sciences, Palackeho 1-3, CZ-612 42 Brno, Czech Republic
| | - Jiri Pikula
- Department of Veterinary Ecology and Environmental Protection, Faculty of Veterinary Hygiene and Ecology, University of Veterinary and Pharmaceutical Sciences, Palackeho 1-3, CZ-612 42 Brno, Czech Republic
| | - Jaromir Hubalek
- Department of Microelectronics, Faculty of Electrical Engineering and Communication, Brno University of Technology, Udolni 53, CZ-602 00 Brno, Czech Republic
| | - Libuse Trnkova
- Department of Microelectronics, Faculty of Electrical Engineering and Communication, Brno University of Technology, Udolni 53, CZ-602 00 Brno, Czech Republic
| | - Rene Kizek
- Department of Chemistry and BiochemistryMendel University of Agriculture and Forestry, Zemedelska 1, CZ-613 00 Brno, Czech Republic.
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Mikelova R, Trnkova L, Jelen F. Double Elimination Voltammetry of Short Oligonucleotides. ELECTROANAL 2007. [DOI: 10.1002/elan.200703937] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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An Investigation of Glutathione-Platinum(II) Interactions by Means of the Flow Injection Analysis Using Glassy Carbon Electrode. SENSORS 2007. [DOI: 10.3390/s7071256] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Hazards of Secondary Bromadiolone Intoxications Evaluated using High-performance Liquid Chromatography with Electrochemical Detection. SENSORS 2007. [DOI: 10.3390/s7071271] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Mikelova R, Trnkova L, Jelen F, Adam V, Kizek R. Resolution of Overlapped Reduction Signals in Short Hetero-oligonucleotides by Elimination Voltammetry. ELECTROANAL 2007. [DOI: 10.1002/elan.200603739] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Krizkova S, Adam V, Petrlova J, Zitka O, Stejskal K, Zehnalek J, Sures B, Trnkova L, Beklova M, Kizek R. A Suggestion of Electrochemical Biosensor for Study of Platinum(II)-DNA Interactions. ELECTROANAL 2007. [DOI: 10.1002/elan.200603737] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Flow Injection Analysis Coupled with Carbon Electrodes as the Tool for Analysis of Naphthoquinones with Respect to Their Content and Functions in Biological Samples. SENSORS 2006. [DOI: 10.3390/s6111466] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
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